Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97c2a086fda043d…

MALICIOUS

PDF

86.2 KB Created: 2021-09-11 21:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f4b8c7072f96fecff4a204faeb114625 SHA-1: 212d4f039d14c0263e226bb0c19a24ea6d830d1a SHA-256: b97c2a086fda043d4594943ed660de10934f6557308f4be90b31a77b1dab2950
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The presence of numerous links pointing to compromised WordPress uploads and disposable hosting suggests a phishing or malware distribution scheme. The file's structure and link farm behavior are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://thefertilizergranulators.com/d/files/nuxerumisadokavive.pdf In PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ae5b83aad---2616372451.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133ddb60b1bc---zukadiwonufejevimug.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/19058319325.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161331b6879b4e---fujakefi.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/9c5b0ed6acf3ddffbf8a1fff51d61722/dinabojagemalusesebumunur.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/61668469963.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/rogijamovujo.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/xosonem.pdfIn PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/40793455768.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351aad4d1c3---63034635932.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/75406531182.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/44763828653.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/gojaxuwezovuben.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/98942139977.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/64015673349.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210902113332.pdfIn PDF document text
    • https://anaksemut.com/contents/files/47148705778.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/gesagorofelaxoraxojuf.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202109030707145946.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///rilulugoxirusokes.pdfIn PDF document text
    • http://limoride.net/gallery/file/50490044922.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/b476fbde13a53220f9ec1ff1ed84bfb6/97624460990.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=nba+2k14apk+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0A 18352 bytes
SHA-256: 84a434315b861cbb128597ceecc575b2015b68136208246dc9a87bb5c19a64f6
font_01_sfnt_off00011bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDF 10340 bytes
SHA-256: 1ab4357a59d61d0f8680ccc6cdefcdb99316d224d2e5e991089508c5b54c1ad2
font_02_sfnt_off0001333e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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